RV Investigator Voyage IN2022_V07 EM122 Multibeam Echosounder Data

This record describes multibeam echosounder data collected on RV Investigator voyage IN2022_V07, HALO - Halimeda bioherm Origins, function and fate in the northern Great Barrier Reef." The voyage took place between August 15, 2022 and September 7, 2022 (AEST), departing from Brisbane and returning to Cairns. Piggyback project: Dinoflagellates & broader planktonic assemblage observation. The Kongsberg EM122 multibeam echosounder was used to acquire seafloor bathymetry, backscatter information and watercolumn backscatter during transit from Brisbane to Cairns, and during deep water operations outside of the Great Barrier Reef. The EM122 provides a 1 degree by 1 degree angular resolution. The echosounder's nominal frequency is 12 kHz. Data are stored in *.all raw format for bathymetry and backscatter and *.wcd format for watercolumn backscatter at CSIRO. There are 176 *.all files totaling 7.21 GB of raw bathymetry/backscatter data and 174 *.wcd files totaling 9.56GB of watercolumn data in this dataset. Sound velocity profiles were applied to this data during data acquisition. Bathymetry data contained in *.all format are corrected for motion and position. Predicted tides were calculated using AusTides 2022 and applied relative to MSL. Processed data had outliers removed. Processed line data are available in *.gsf and ascii format, and processed bathymetry and backscatter grids in geotiff format. Additional information regarding this dataset, including information on processing streams, is contained in the GSM data acquisition and processing report. Additional data products may be available on request.

本数据集记录了“调查者号（RV Investigator）”科考船IN2022_V07航次“HALO——大堡礁北部仙掌藻生物丘的起源、功能与归宿”项目采集的多波束测深数据。该航次于2022年8月15日至2022年9月7日（澳大利亚东部标准时间，AEST）执行，从布里斯班起航，最终返回凯恩斯。本次航次附带开展的研究项目为：甲藻及更广范围浮游生物群落观测。本次数据采集采用Kongsberg EM122多波束测深仪（multibeam echosounder）：在从布里斯班前往凯恩斯的航行途中，以及大堡礁外的深水作业期间，同步采集了海底测深（seafloor bathymetry）、反向散射信息以及水体柱反向散射数据。该测深仪的角分辨率为1°×1°，标称工作频率为12 kHz。在澳大利亚联邦科学与工业研究组织（CSIRO），测深与反向散射原始数据以*.all格式存储，水体柱反向散射数据则以*.wcd格式存储。本数据集包含176个*.all文件，总容量达7.21 GB的原始测深/反向散射数据；另有174个*.wcd文件，总容量达9.56 GB的水体柱数据。数据采集阶段已针对该数据应用声速剖面（sound velocity profile）校正。*.all格式存储的测深数据已完成运动校正与位置校正。利用AusTides 2022计算预报潮汐，并以平均海平面（Mean Sea Level，MSL）为基准完成潮汐校正。处理后的数据已完成异常值剔除。经处理的测线数据可通过*.gsf与ASCII格式获取，经处理的测深与反向散射栅格数据则以GeoTIFF格式提供。有关本数据集的更多信息（包括处理流程详情）均收录于《GSM数据采集与处理报告》中。此外，可根据申请获取额外的数据产品。